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The Largest Known Cave Art In North America Has Been Discovered In Alabama. The Artwork, A Native American Drawing, Had Remained Unseen For More Than 1000 Years Before It Was Found In A Cave That Was First Discovered In 1998. The Giant Artworks, Which Could Depict Spirits Of The Underworld, Was Discovered Using A 3D Scan Method.

Largest Native American cave art remained hidden for more than 1,000 years – CNN Style

https://www.cnn.com/style/article/largest-native-american-cave-art-scn/index.html

Massive Native American drawings, unseen in an Alabama cave for more than 1,000 years, have been revealed thanks to 3D imaging. It’s the largest known cave art ever discovered in North America.